Switch to process isolation mode by default and give an option to use…

… hyperv isolation to improve performance

action.yml

@@ -117,6 +117,11 @@ inputs:
       'Amount of memory to assign the docker container. Defaults to 95% of total system memory rounded down to the
       nearest megabyte on Linux and 80% on Windows. On unrecognized platforms, defaults to 75% of total system memory.
       To manually specify a value, use the format <number><unit>, where unit is either m or g. ie: 512m = 512 megabytes'
+  dockerIsolationMode:
+    required: false
+    default: 'process'
+    description:
+      'Isolation mode to use for the docker container. Can be either process or hyperv. Only applicable on Windows'
   allowDirtyBuild:
     required: false
     default: ''

src/model/docker.ts

@@ -98,6 +98,7 @@ class Docker {
       dockerWorkspacePath,
       dockerCpuLimit,
       dockerMemoryLimit,
+      dockerIsolationMode,
     } = parameters;
 
     return `docker run \
@@ -118,6 +119,7 @@ class Docker {
             --volume "${actionFolder}/BlankProject":"c:/BlankProject" \
             --cpus=${dockerCpuLimit} \
             --memory=${dockerMemoryLimit} \
+            --isolation=${dockerIsolationMode} \
             ${image} \
             powershell c:/steps/entrypoint.ps1`;
   }

src/model/input.ts

@@ -252,6 +252,10 @@ class Input {
     );
   }
 
+  static get dockerIsolationMode(): string {
+    return Input.getInput('dockerIsolationMode') || 'process';
+  }
+
   public static ToEnvVarFormat(input: string) {
     if (input.toUpperCase() === input) {
       return input;